Trees to Avoid
These are either trees on the Colorado Noxious Weed List or are not recommended for our area.
Colorado Department of Agriculture: List B species. The goal is to stop the spread of the indicated species.
Unfortunately, this tree out-competes native
streamside vegetation and is no
longer allowed to be sold in Colorado.
Tamarix chinensis, T. Parviflors,
and T. ramosissima
Department of Agriculture: Plant Industry Division. Prunus species OTHER THAN those listed below are not allowed to be imported into the San Luis Valley. The purpose of this Quarantine is to protect the potato fields in Alamosa, Conejos, Costilla, Rio Grande and Saguache counties against the over wintering host of the primary aphid vector of certain viral diseases that affect potatoes. To see the latest data, go to the CO State webpage tinyurl.com/d8pc3xw and click on the "1.00 Quarantine" link.
The following are the ONLY ALLOWED PRUNUS species
Western Sand Cherry
Purple Leaf Sand Cherry
Not oulawed, but discouraged.
Chinese (Siberian) Elm
These prolific seeders are responsible for
the gutters full of seeds in the spring.
Weedy volunteers sprout throughout
Colorado. They are short-lived trees
that shed limbs easily
in snow or wind storms
and are susceptible to
elm leaf beetle. Consider the American Elm,
Ulmus americana, as an alternative.